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مکانیک::
درجه آزادی
These studies show that adding a degree-of-freedom (DOF) to the system results in
However, for system such as those depicted in Figures 2.4 (a) and (b) which have one degree-of-freedom (1DOF) and undergo 1DOF VIV, the lock-in ranges are not always like these and there are other physical parameters which can widen or narrow down these ranges.
They illustrated that for high and moderate mass ratios (m*>6 as they suggested) the effects of streamwise oscillations are negligible and adding this degree-of-freedom to a spring-cylinder VIV system does not influence its behaviour.
However, when m*<6, this extra degree-of-freedom plays a crucial role and dramatically changes the dynamics of the VIV system.
The results shown in Figure 2.13 illustrate that as m* decreases the maximum mean drag of cylinder with two degrees- of-freedom deviates from its one degree-of-freedom counterpart.
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